Tech Works NC-AN-16C Quick Reference Manual

NC-AN-16C & 32C-T QUICK REFERENCE GUIDE
The Tech Works NC-AN-16C-T is a 16-Light Intelligent Annunciator panel and the NC-AN-32C-
T is a 32 Light Intelligent Annunciator Panel. Made of white ABS plastic with a removable
faceplate, each unit can be custom labeled to identify staff or locations. An integral tone sounds
to draw attention to any change of status.
W B B
H L R L Wiring is four screw terminals to interface to the Tech Works Network. The
I A E A
T C D C
Network is 2 twisted pair wires. One Pair of wires is Network Communication data
E K K
and the other pair is power. Wire must be connected "T" to "T", "R" to "R", "+"
to +", and "-" to "-" between devices or from device to device for proper
operation.
Be sure to tighten the screw on the wire tightly. U.L. Torque Spec: 3.5 lb. / in.
The first pair is RS485 terminated bus topology, operating at 39K baud in a parallel connection
plan. Because this is a distributed processor system, each intelligent device contains a micro
controller, so there is "NO Central Processor". Each device is totally self-contained and can be
used as a stand alone or in combination with any other intelligent device. The second pair is 12
VDC power in a parallel connection plan.
The system is designed to operate on unshielded twisted pair cable from 24 to 18 AWG.
The twist of the cable is critical to the proper communication of data on the network to avoid
noise interference. Any standard voice grade twist should provide adequate noise cancellation
under normal operating conditions. All wiring is NEC Class 2.
T
R
+
-
Due to the implementation of innovative data noise canceling circuits in all Tech Works RS485
microprocessor products, the data and power can now be run in any direction up to a total wire
length of 3000 feet per network. The last station on each end of all wire runs must employ a
terminating resistor to make the network operate correctly. The terminator is built into each
station and selected by turning "ON" the "T" dipswitch. If a terminator is placed in the middle,
data will not flow to all devices in the system causing irregular operation.
As with any RS485 communication system grounding is critical to the proper operation and life
expectancy of the system. All Tech Works power supplies employ a floating ground designed
to isolate the data communication from interference and destructive electro static discharges.
The use of multiple power supplies on the same network will cause different floating ground
references (ground loops) which may cause noise and destruction of the intelligent devices. If
multiple power supplies are required, be sure to connect all "-" or common wires together
between power supplies for a "common" reference.
800-813-1080 www.techworks-usa.com
T
R
+
-
07/21